Any Drainage Engineers on here

[paulus 26]

I live in a Cul De sac of 25 houses, 18 years ago when we were putting the fence up, we were using a hole borer, when we neared the top of the garden the hole started filling up with water at a depth of 2 1/2ft ish, The water did not rise out of the hole so we knew we had not hit a pipe. The part i live on is a slight slop running down to open fields 3 houses down. The land here has always been wet in the winter and we never have to water the lawn in the summer as it always stays green, Recently planning permission was granted to build 67 houses in the fields at the bottom of the slope, This work is now in its 6th week, However all the houses on the slope and running across the bottom have started to get bad flooding in their gardens, Mine is like a paddy field, I dug a hole at the highest point of the garden and again found water but this time only a foot down This water then is coming to the surface  under the slabbed path and onto the lawn, running into next doors garden and so on.  Any ideas?

[Greyman 26,327]

Sounds like time to build an ark, but joking aside ground water don’t always go to the bottom of the hill, my brother in law Wes a driller and soil sampler he tested the ground before building commenced and I remember a few occasions were he has hit water on high ground there is a golf course near me that’s way above any low lying land pretty elevated but a couple of meters down he hit what must have been an underwater lake the gusher was immense, you can have a solid crust of a meter or two with water underneath so the builders may have breached the crust, most of  portishead is built on a crust above 20 meters of liquid house there are  less than 20 yo and having terrible issues ??? 

[ditchman 1,773]

dig a sump....put a submersible in it with a high/low level float and pipe the water off....................something you can do yourself and not too much money

[paulus 26]

1 minute ago, Greyman said:

Sounds like time to build an ark, but joking aside ground water don’t always go to the bottom of the hill, my brother in law Wes a driller and soil sampler he tested the ground before building commenced and I remember a few occasions were he has hit water on high ground there is a golf course near me that’s way above any low lying land pretty elevated but a couple of meters down he hit what must have been an underwater lake the gusher was immense, you can have a solid crust of a meter or two with water underneath so the builders may have breached the crust, most of  portishead is built on a crust above 20 meters of liquid house there are  less than 20 yo and having terrible issues ??? 

What i think is happening is, The water course has always been there, No idea why? But the ground work being carried out for the new houses at the bottom of the road is restricting the water from flowing down the hill, Hence its backing up the hill. The houses across the bottom of the street are also having flooding issues in there gardens, This is the entrance to the site last week, This entrance runs parallel behind the houses at the bottom, 

[paulus 26]

1 minute ago, ditchman said:

dig a sump....put a submersible in it with a high/low level float and pipe the water off....................something you can do yourself and not too much money

All the houses here are on front and back soak away`s, but are obviously being overwhelmed by the amount of water, i asked about piping the water off but the water company will not allow me to pump it into the waste water system,   

[TOMO 25,226]

Just ask mchull he will know

[mC HULL 10,726]

16 minutes ago, TOMO said:

Just ask mchull he will know

all i know is like has been said the water level can be close to the surface if it was new builds they will normally put a massive underground  sump or sumps to hold the excess when its real bad rain they come and empty them to stop the flooding 

 

knowledge is power young tomo. lol

[THE STIFFMEISTER 14,716]

What you must first remember is that the ground is an ever changing engineering material . 

the building of the new housing may well have affected the strength , stiffness and permeability of the land around and more pertinently beneath you. 

it reads as likely that the compaction , excavation of the ground for housing beneath your ground level in the water table has altered the soil structure and is causing a lack of natural drainage. 

Movement of water may cause it to settle once construction is complete. 

however , as Karen like as it appears , If you are receiving vastly different levels of water historically, it is the responsibility of the client to ensure that contractors adhere to key stakeholders recommendations. 

id imagine that the environment agency would be part of this , they would be my first point of contact . 

Drainage is largely constructed to manage with worst case scenario levels of water . Over engineered if you like . The construction of an interception ditch higher up than your houses , or lower down to smooth the drainage cycle may alleviate this problem for you and your neighbours.

This will remain the responsibility of the client , designer and contractor between them . 
 

 @WILF f**k off , f**k right off 
 

 

[WILF 44,733]

26 minutes ago, THE STIFFMEISTER said:

What you must first remember is that the ground is an ever changing engineering material . 

the building of the new housing may well have affected the strength , stiffness and permeability of the land around and more pertinently beneath you. 

it reads as likely that the compaction , excavation of the ground for housing beneath your ground level in the water table has altered the soil structure and is causing a lack of natural drainage. 

Movement of water may cause it to settle once construction is complete. 

however , as Karen like as it appears , If you are receiving vastly different levels of water historically, it is the responsibility of the client to ensure that contractors adhere to key stakeholders recommendations. 

id imagine that the environment agency would be part of this , they would be my first point of contact . 

Drainage is largely constructed to manage with worst case scenario levels of water . Over engineered if you like . The construction of an interception ditch higher up than your houses , or lower down to smooth the drainage cycle may alleviate this problem for you and your neighbours.

This will remain the responsibility of the client , designer and contractor between them . 
 

 @WILF f**k off , f**k right off 
 

 

Riveting……utterly, utterly riveting ! 
 

If you are on a hill it’s probably underground springs……you can read this after you wake up from reading the post above ! 

Edited April 3 by WILF

[WILF 44,733]

 

Edited to add:

As you can see you can not engineer out springs as they are actually part of the strata, you can only TRY and engineer a diversion of course when they over flow (say after a prolonged period of rain) and I’m guessing they ain’t factoring that into most housing development budgets…..Im guessing most builders won’t even commission a geological  survey to see if they are there in the first place. 

Edited April 3 by WILF

[Qbgrey 3,992]

Could be a number of things , if they have stripped too soil off and been digging piles, or foundations this could effect run off or poss damage field drainage, basically messed up the existing natural way the water used to go, tarmac, paths, drives, etc will affect the draining , a lot of new builds use the suds systems nowadays for water control, not sure what type your housing people are using .

[chartpolski 20,835]

24 minutes ago, WILF said:

 

Edited to add:

As you can see you can not engineer out springs as they are actually part of the strata, you can only TRY and engineer a diversion of course when they over flow (say after a prolonged period of rain) and I’m guessing they ain’t factoring that into most housing development budgets…..Im guessing most builders won’t even commission a geological  survey to see if they are there in the first place. 

That’s alright for you to say; but if psi is being used a variable, as it appears here, (h = z + psi), then it’s of no use to Paulus.

It would need to be a constant, relating to the gradient x length, (average), of his property !

Im sure my mate mC would be in complete agreement ! 
 

Cheers.

[Qbgrey 3,992]

High water table made worse by housing pressure below. f**k knows 

[WILF 44,733]

7 minutes ago, chartpolski said:

That’s alright for you to say; but if psi is being used a variable, as it appears here, (h = z + psi), then it’s of no use to Paulus.

It would need to be a constant, relating to the gradient x length, (average), of his property !

Im sure my mate mC would be in complete agreement ! 
 

Cheers.

Nope, I can get as far underground springs…..I can also get as far as concreting over things leaves less ground to soak water and monoculture crops which cause degraded soil also effect the grounds ability to retain water.

So it’s either the tank is full up or the tank can’t get filled in the first place.

Don’t know  what the PSI+pye number of that is but that’s what it is ! 

 

Edited April 3 by WILF

[mC HULL 10,726]

8 minutes ago, chartpolski said:

That’s alright for you to say; but if psi is being used a variable, as it appears here, (h = z + psi), then it’s of no use to Paulus.

It would need to be a constant, relating to the gradient x length, (average), of his property !

Im sure my mate mC would be in complete agreement ! 
 

Cheers.

i ain’t got a clue what your on about lol